lkml.org 
[lkml]   [2013]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ 18/71] SUNRPC: Ensure we release the socket write lock if the rpc_task exits early
On Tue, Jan 15, 2013 at 02:54:15PM -0800, Greg Kroah-Hartman wrote:
> 3.0-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Trond Myklebust <Trond.Myklebust@netapp.com>
>
> commit 87ed50036b866db2ec2ba16b2a7aec4a2b0b7c39 upstream.
>
> If the rpc_task exits while holding the socket write lock before it has
> allocated an rpc slot, then the usual mechanism for releasing the write
> lock in xprt_release() is defeated.
>
> The problem occurs if the call to xprt_lock_write() initially fails, so
> that the rpc_task is put on the xprt->sending wait queue. If the task
> exits after being assigned the lock by __xprt_lock_write_func, but
> before it has retried the call to xprt_lock_and_alloc_slot(), then
> it calls xprt_release() while holding the write lock, but will
> immediately exit due to the test for task->tk_rqstp != NULL.
>
> Reported-by: Chris Perl <chris.perl@gmail.com>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This is marked only for kernel versions 3.1 and later, which looks
correct as it seems to address a problem starting with commit
43cedbf0e8dfb9c5610eb7985d5f21263e313802

--
[]'s
Herton


\
 
 \ /
  Last update: 2013-01-17 17:01    [W:0.358 / U:0.864 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site